期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 777, 期 -, 页码 1304-1312出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.11.070
关键词
C@SiO2 double-shelled hollow microspheres; CTAB functionalization; Extraction; Cr(VI) removal; Selective adsorption performance
资金
- National Natural Science Foundation of China [21476179]
- one hundred talents project of Guangzhou University
- Wuhan Yellow Crane Talents (Science) Program
A novel cetyltrimethylammonium bromide (CTAB)-functionalized C@SiO2 with structure of double-shelled hollow microspheres (F-C@SiO2) was successfully synthesized by hydrolysis of tetraethyl orthosilicate (TEOS) on the carbonaceous hollow sphere (C). The as-prepared F-C@SiO2, C@SiO2 resulting from extracting CTAB from F-C@SiO2, and C were characterized comparatively by XRD, TGA-DSC, SEM, TEM, N-2 adsorption-desorption and zeta potential. Batch adsorption experiments show that the FC@SiO2 with CTAB functionalization presents the fastest adsorption kinetics and the highest adsorption capacity of 202.02 mg g(-1) towards Cr(VI) among the samples (161.81 mg g(-1) for C@SiO2 and 33.16 mg g(-1) for C, respectively). The adsorption mechanisms involving the electrostatic attraction and reduction reaction were also discussed. In addition, coexistence of the ion interference experiments show that the F-C@SiO2 has a highly selective adsorption capacity of 91.11 mg g(-1) towards Cr(VI) under a multiple system of Cr(VI), Cu2+, Cd2+, Zn2+, and Ni2+ with the concentration of 100 mg L-1, respectively. The successful decoration of the CTAB and the SiO2 onto the external surface of the hollow C spheres provides an effective method to develop promising composite for Cr(VI) removal from wastewater. (C) 2018 Elsevier B.V. All rights reserved.
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